APA (7th ed.) Citation

Belmont, E. R., Ford, H., & Stevenson, B. E. (1925). In the next room: A play in three acts. S. French; [etc.].

Chicago Style (17th ed.) Citation

Belmont, Eleanor Robson, Harriet Ford, and Burton Egbert Stevenson. In the Next Room: A Play in Three Acts. New York: S. French; [etc.], 1925.

MLA (9th ed.) Citation

Belmont, Eleanor Robson, et al. In the Next Room: A Play in Three Acts. S. French; [etc.], 1925.